Sofa



FIG. 1 is a perspective view of a sofa, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG, 4 is an elevational view of one end, the opposite end being a mirror image thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a sofa, as shown and described. 